854
FNUS21 KWNS 101651
FWDDY1
DAY 1 FIRE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1150 AM CDT WED SEP 10 2025
VALID 101700Z - 111200Z
..WASHINGTON
ISOLATED THUNDERSTORMS ARE EXPECTED ALONG THE HIGHER TERRAIN OF THE
CASCADE RANGE IN CENTRAL AND NORTH-CENTRAL WA THIS AFTERNOON. PWAT
VALUES IN THE 0.65-0.85 INCH RANGE WILL SUPPORT WETTING RAIN CORES
IN SLOWER MOVING THUNDERSTORMS. HOWEVER, LIGHTNING STRIKES OUTSIDE
OF HEAVIER PRECIPITATION CORES COULD LEAD TO SOME NEW IGNITIONS IN
DROUGHT STRESSED, HEAVIER FUELS. GUSTY OUTFLOW WINDS COULD ALSO
IMPACT EXISTING ACTIVE FIRES IN THE WASHINGTON CASCADES THIS
AFTERNOON.
..EASTERN NEVADA/WESTERN UTAH
AN ADVANCING MID-LEVEL JET, RELATIVELY DRY BOUNDARY LAYER AND
DAYTIME MIXING WILL SUPPORT STRONG, SUSTAINED SOUTH TO SOUTHWEST
WINDS OF UP TO 25 MPH ACROSS EASTERN NV AND WESTERN UT THIS
AFTERNOON. DAYTIME RELATIVE HUMIDITY AS LOW AS 10% COMBINED WITH
THE SOUTH TO SOUTHWEST WINDS WILL SUPPORT AN ELEVATED FIRE WEATHER
THREAT ACROSS THIS REGION, DESPITE MARGINAL FUEL DRYNESS. A SLIGHT
NORTHWARD EXPANSION OF ELEVATED HIGHLIGHTS INTO FAR NORTHWESTERN UT
AND FAR SOUTH CENTRAL ID WAS PRUDENT BASED ON LATEST MODEL GUIDANCE
AND CURRENT RELATIVE HUMIDITY IN NORTHWESTERN UT ALREADY BELOW 15%.
..WILLIAMS.. 09/10/2025
PREV DISCUSSION
/ISSUED 1245 AM CDT WED SEP 10 2025/
..SYNOPSIS
THE UPPER-LEVEL TROUGH IN THE WEST WILL CONTINUE ITS SLOW EASTWARD
PROGRESS INTO THE GREAT BASIN. THE MID-LEVEL JET WILL INTENSIFY
WITHIN THE SOUTHERN AND EASTERN GREAT BASIN. COOLER AIR ALOFT AND
MARGINAL MID-LEVEL ASCENT WILL ALSO PROMOTE SOME CONVECTION IN
WASHINGTON.
..WASHINGTON
A POCKET OF DRIER FUELS EXISTS IN THE COLUMBIA BASIN AND NEARBY
VICINITY. RECENT LIGHTNING ACTIVITY HAS LED TO FIRE STARTS. GIVEN
THE CURRENT CONVECTION IN OREGON MOVING NORTH AND WEST AROUND THE
UPPER-LOW, SOME LIGHTNING ACTIVITY CAN BE EXPECTED EARLY THIS
MORNING. ADDITIONAL THUNDERSTORMS APPEAR POSSIBLE DURING THE
AFTERNOON AND PERHAPS AGAIN OVERNIGHT TONIGHT. HOWEVER, THOSE STORMS
MAY POSE A LESSER LIGHTNING IGNITION THREAT GIVEN INCREASING PWAT
VALUES THROUGH THE PERIOD.
..EASTERN NEVADA/WESTERN UTAH
STRONG SURFACE WINDS OF 15-25 MPH WILL OVERSPREAD PARTS OF THE GREAT
BASIN BENEATH THE MID-LEVEL JET. RH COULD FALL NEAR 10% LOCALLY, BUT
15-20% WILL BE MORE COMMON. GIVEN THE POTENTIAL FOR CRITICAL
METEOROLOGICAL CONDITIONS, ELEVATED FIRE WEATHER CONCERNS ARE
EXPECTED DESPITE THE UNFAVORABLE TO MARGINAL FUEL RECEPTIVENESS IN
THESE AREAS.
..PLEASE SEE WWW.SPC.NOAA.GOV/FIRE FOR GRAPHIC PRODUCT
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